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Old 08-19-2018, 01:06 PM   #1
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Mercedes-Benz 6.4L MBE906 I6 - Intructions for Replacing Alternator

Hello,

I'm trying to replace my alternator on our 2007 Thomas Built Freightliner. I have ordered a new one and I am tempted to just start taking apart connections that are in the way of removing the alternator, but I'm trying to get some insight on the proper way to do it. I've included some photos. Also couldn't find a Mercedes engine section so I'm posting here. I would've taken it to a shop, but the bus is stranded at our house because the alternator died.



Thanks.

Sincerely,

Dillon and Abby
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Old 08-19-2018, 05:10 PM   #2
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Doesn't look to tough, hardest part may be getting at the belt tensioner.
Hope you have sockets and extensions. Take pics so you get it back together correctly, mechanically and electrically.
Do your self a favour and disconnect main batteries before anything.


John
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Old 08-19-2018, 05:19 PM   #3
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Originally Posted by BlackJohn View Post
Doesn't look to tough, hardest part may be getting at the belt tensioner.
Hope you have sockets and extensions. Take pics so you get it back together correctly, mechanically and electrically.
Do your self a favour and disconnect main batteries before anything.


John
Ya, that compressor sitting right on top of the motor didn't look too tough either. After removing 7 of the 8 bolts securing the compressor to the bracket, and 4 of 5 bolts out of the bracket and everything is till solid. That's when I found one more hidden bolt on the front of the compressor and one more bracket bolt, neither can be reached without pulling the front grill and radiator out of the way. Figure another hours work to get to the bolts that will take 1 minute to remove.
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Old 08-19-2018, 05:30 PM   #4
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Originally Posted by o1marc View Post
Ya, that compressor sitting right on top of the motor didn't look too tough either. After removing 7 of the 8 bolts securing the compressor to the bracket, and 4 of 5 bolts out of the bracket and everything is till solid. That's when I found one more hidden bolt on the front of the compressor and one more bracket bolt, neither can be reached without pulling the front grill and radiator out of the way. Figure another hours work to get to the bolts that will take 1 minute to remove.



There's a catch to every job it seems. I don't mind because the designers only have so much room to make it all fit. Much easier when going down an assembly line to install but you do what you have to do at times. That alternator should wiggle in and out with enough cursing.


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Old 08-19-2018, 07:39 PM   #5
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What kind of alternator do you have.. Mine broke also ( mbe906) but that was the regulator. May be check the brushes first and or have the regulator tested. what kind of failure , no charge , over charge, Does your alternator light stay on?


Good luck, Johan
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Old 08-20-2018, 01:34 PM   #6
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What kind of alternator do you have.. Mine broke also ( mbe906) but that was the regulator. May be check the brushes first and or have the regulator tested. what kind of failure , no charge , over charge, Does your alternator light stay on?


Good luck, Johan
Put new batteries in, correctly sized and hooked up. Started the bus and the alternator shorted and caught the insulation on fire. Don't have the type of alternator handy on me, but thank you all for the advice! Really appreciate it!
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Old 08-20-2018, 03:36 PM   #7
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I guess new brushes are not going to fix it. If you with whatever low chance thought or were not sure if you had the battery inverted then I would disconnect the alternator and see if the engine is still running and see if the tranny is still shifting correctly before you replace the alternator.


Good luck, j
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Old 08-21-2018, 12:51 PM   #8
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I guess new brushes are not going to fix it. If you with whatever low chance thought or were not sure if you had the battery inverted then I would disconnect the alternator and see if the engine is still running and see if the tranny is still shifting correctly before you replace the alternator.


Good luck, j
Thank you J, I'll definitely need to double check that. Probably prob around with an voltmeter just to double check my work.
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